.timeline-backdrop {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(0px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease, backdrop-filter 0.3s ease;
    z-index: 45;
}

.timeline-backdrop.is-open {
    opacity: 1;
    backdrop-filter: blur(2px);
    pointer-events: auto;
}

.timeline-sidebar {
    position: fixed;
    inset-inline-end: 0;
    top: 0;
    bottom: 0;
    width: min(420px, 92vw);
    background-color: var(--bg-elevated);
    border-inline-start: 1px solid var(--border);
    box-shadow: var(--shadow-card);
    z-index: 46;
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform 0.32s cubic-bezier(0.16, 1, 0.3, 1);
}

[dir="rtl"] .timeline-sidebar {
    transform: translateX(-100%);
}

.timeline-sidebar.is-open {
    transform: translateX(0);
}

.timeline-header {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: calc(1rem + env(safe-area-inset-top)) 1.1rem 1rem;
    border-bottom: 1px solid var(--border-soft);
}

.timeline-header h2 {
    font-size: 1rem;
    color: var(--all-accent);
    margin: 0;
    flex: 1;
    min-width: 0;
}

.sidebar-back {
    display: inline-flex;
    align-items: center;
    gap: 0.15rem;
    margin: 0;
    margin-inline-start: -0.4rem;
    padding: 0.4rem 0.7rem 0.4rem 0.45rem;
    padding-inline: 0.45rem 0.7rem;
    border: 1px solid transparent;
    border-radius: 999px;
    background: transparent;
    color: var(--accent);
    font: inherit;
    font-size: 0.92rem;
    font-weight: 600;
    line-height: 1;
    letter-spacing: 0;
    cursor: pointer;
    flex-shrink: 0;
    white-space: nowrap;
    -webkit-tap-highlight-color: color-mix(in srgb, var(--accent) 28%, transparent);
    transition: background-color 0.12s ease, border-color 0.12s ease, transform 0.12s ease, color 0.12s ease, box-shadow 0.12s ease;
}

.sidebar-back[hidden] {
    display: none;
}

.sidebar-back:hover {
    background: var(--accent-soft);
    border-color: color-mix(in srgb, var(--accent) 28%, transparent);
}

.sidebar-back:active,
.sidebar-back.is-pressed {
    background: var(--accent);
    border-color: var(--accent);
    color: #04121c;
    transform: scale(0.96);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.sidebar-back-arrow {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    display: block;
}

.sidebar-back-arrow svg {
    display: block;
    width: 100%;
    height: 100%;
}

[dir="rtl"] .sidebar-back-arrow {
    transform: scaleX(-1);
}

.timeline-filter-bar {
    padding: 1rem 1.1rem 0;
}

.trash-empty-btn {
    margin-inline-start: auto;
    font-size: 0.74rem;
    padding: 0.35rem 0.7rem;
    color: var(--danger);
    border-color: var(--danger);
    flex-shrink: 0;
}

.trash-empty-btn:hover {
    color: #fff;
    background-color: var(--danger);
}

.trash-confirm-bar {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    margin: 0.9rem 1.1rem 0;
    padding: 0.9rem 1rem;
    background-color: var(--danger-soft);
    border: 1px solid var(--danger);
    border-radius: var(--radius-md);
    animation: fade-in 0.2s ease;
}

.trash-confirm-bar[hidden] {
    display: none;
}

.timeline-list {
    flex: 1;
    overflow-y: auto;
    padding: 1rem 1.1rem calc(1rem + env(safe-area-inset-bottom));
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
}

.timeline-day-group {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
}

.timeline-day-header {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--all-accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding-bottom: 0.35rem;
    border-bottom: 1px solid var(--border-soft);
}

.timeline-entry {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    width: 100%;
    text-align: start;
    background-color: var(--card-bg);
    border: 1px solid var(--border-soft);
    border-inline-start: 3px solid var(--all-accent);
    border-start-end-radius: var(--radius-sm);
    border-end-end-radius: var(--radius-sm);
    padding: 0.55rem 0.7rem;
    font-family: inherit;
    font-size: 0.82rem;
    color: var(--text-main);
    cursor: pointer;
    transition: background-color 0.15s ease;
}

.timeline-entry:hover {
    background-color: var(--card-bg-hover);
}

.timeline-entry-dot {
    flex-shrink: 0;
    width: 6px;
    height: 6px;
    margin-top: 0.45rem;
    border-radius: 50%;
    background-color: var(--all-accent);
}

.timeline-entry-text {
    flex: 1;
    min-width: 0;
    overflow-wrap: break-word;
}

.timeline-entry-photo {
    flex-shrink: 0;
    font-size: 0.85rem;
    line-height: 1;
}

.timeline-entry-chevron {
    flex-shrink: 0;
    display: inline-block;
    unicode-bidi: isolate;
    direction: ltr;
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.3;
}

[dir="rtl"] .timeline-entry-chevron {
    transform: scaleX(-1);
}